Guides

How to reply to an email you forgot to answer (with examples)

Updated October 20, 2026

Short answer: Reply now, apologize once in a few words, and lead with the answer or the next step, not the excuse. A few days late needs only “Sorry for the slow reply”. A few weeks late, check that it still matters and offer something useful. Months late, say so plainly and ask whether it’s still relevant.

Everyone has one: the email you meant to answer properly, which got harder to answer the longer it sat. The other person almost always cares less about the delay than you do. What they wanted was the answer, and that’s still what they want.

One line of sorry, then the answer

• Apologize once, briefly: “Sorry for the slow reply” or “Sorry this took me so long.” A paragraph of apology makes the delay the subject.
• Lead with what they asked for: the answer, the file, the decision, or the date you’ll have it.
• Leave out the excuse unless it helps them. “I was swamped” tells them nothing; “I was waiting on the numbers from finance” tells them why.

A few days late

A few weeks late

Check first whether the question still stands: the meeting may have happened, or the decision may have been made without you. If it still matters, answer it. If the moment passed, say so, and offer what’s still useful.

Months late

Name the time honestly and ask whether it’s still relevant, rather than answering a question that may no longer exist.

When they already followed up

Answer the follow-up rather than the original, and thank them for the nudge: it means they still need it. “Thanks for the nudge, and sorry for the wait” is all the apology it takes.

When you don’t need to reply

• Newsletters, FYIs, and threads that settled without you.
• A question someone else on the thread already answered.
• A cold pitch you weren’t going to take up.

If you’re not sure, a one-line reply costs less than wondering about it.

So it doesn’t happen again

Emails get forgotten when the reply needs something you don’t have yet: a number, a decision, an hour to think. Answer with what you know now, or say when you’ll know (“I’ll get back to you by Friday”), so the thread is settled for them and on your list for you.